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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [include/] [asm-m68knommu/] [delay.h] - Rev 1633
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#ifndef _M68K_DELAY_H #define _M68K_DELAY_H extern unsigned long loops_per_sec; #include <linux/kernel.h> #include <linux/config.h> /* * Copyright (C) 1994 Hamish Macdonald * * Delay routines, using a pre-computed "loops_per_second" value. */ extern __inline__ void __delay(unsigned long loops) { __asm__ __volatile__ ("1: subql #1,%0; jcc 1b" : "=d" (loops) : "0" (loops)); } /* * Use only for very small delays ( < 1 msec). Should probably use a * lookup table, really, as the multiplications take much too long with * short delays. This is a "reasonable" implementation, though (and the * first constant multiplications gets optimized away if the delay is * a constant) */ extern __inline__ void udelay(unsigned long usecs) { #ifdef CONFIG_M68332 usecs *= 0x000010c6; __asm__ __volatile__ ("mulul %1,%0:%2" : "=d" (usecs) : "d" (usecs), "d" (loops_per_sec)); __delay(usecs); #endif #if defined(CONFIG_M68328) || defined(CONFIG_M68EZ328) || defined(CONFIG_COLDFIRE) /* Sigh */ __delay(usecs); #endif } #define muldiv(a, b, c) (((a)*(b))/(c)) /* extern __inline__ unsigned long muldiv(unsigned long a, unsigned long b, unsigned long c) { unsigned long tmp; __asm__ ("mulul %2,%0:%1; divul %3,%0:%1" : "=d" (tmp), "=d" (a) : "d" (b), "d" (c), "1" (a)); return a; } */ #endif /* defined(_M68K_DELAY_H) */
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